检查应用程序是否首次在Flutter上运行

使用共享首选项包。您可以使用阅读它

FutureBuilder

welcome

return new FutureBuilder<SharedPreferences>(      future: SharedPreferences.getInstance(),      builder:          (BuildContext context, AsyncSnapshot<SharedPreferences> snapshot) {        switch (snapshot.connectionState) {          case ConnectionState.none:          case ConnectionState.waiting: return new LoadingScreen();          default: if (!snapshot.hasError) {   @ToDo("Return a welcome screen")   return snapshot.data.getBool("welcome") != null       ? new MainView()       : new LoadingScreen(); } else {   return new ErrorScreen(error: snapshot.error); }        }      },    );